orca.host.ui.create_dock_panel() hosts plugin HTML in a pane of the
Plater's dock manager, next to the sidebar, and returns a UiDockPanel
handle (post/show/hide/close/is_open). The panel reuses the window.orca
bridge of plugin windows, restores its position and size from the saved
window layout, hides with the Plater off the Prepare and Preview tabs
when floating, and is closed with its plugin.
Includes a sample plugin (sandboxes/orca_dock_panel_plugin_any.py) and
binding and layout-helper tests in slic3rutils.
wx 3.3.2 delivers webview script messages synchronously inside the native
callback on GTK and macOS, so script plugins run with the plugins-dialog
webview's signal/delegate frame on the stack. Creating and presenting the
orca.host.ui window from there crashed on Linux at Raise() --
gtk_window_present while GTK's deferred show was still in flight.
Defer the whole window creation to a CallAfter with a pre-bound registry
handle (post/close stay FIFO-safe, teardown races become a no-op), and
drop Raise() plus the show_modeless_dialog wrapper: Show() already
activates and fronts a new window on every platform.
Hanif Koh